Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/13192#discussion_r63913511
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateMutableProjection.scala
---
@@ -124,6 +124,7 @@ object GenerateMutableProjection extends
CodeGenerator[Seq[Expression], MutableP
public java.lang.Object apply(java.lang.Object _i) {
InternalRow ${ctx.INPUT_ROW} = (InternalRow) _i;
+ /*** project list:
${expressions.map(_.toCommentSafeString).mkString(", ")} */
--- End diff --
When there are many columns, the comments are far away from their code,
it's better to interweave them.
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